I bought my betta, Charles, about 3 weeks ago, and he had a very mild case of fin rot. I thought I could save him, but maybe I was wrong.
When I bought him, it was upstate New York. However, I live in New York City. He survived the four hour car drive ( I wasn't expecting him to have to come back with me though, he wasn't intended to ever have to go back in a car, sigh.) Anyway, I cycled a 10g tank and settled him in. He seemed to be doing alright, eating regularly and being active. Though, his fin rot didn't seem to get any better. It started to get worse a couple of days ago, and I've now started him on a combo of maracyn, maracyn II, and salt. I'm on day 4 of the medication, and he's only been getting worse. I even kept something over the tank to keep it dark, seeing as Maracyn II is photosensitive.
It's so bad now. Looking at him makes me want to cry. His anal fins were regrowing so beautifully, and in the matter of a night, most of the entire fin came off. I moved him into a little 1g bowl, as a hospital tannk, with a heater. I need help, I can't lose this fish.
Charles soon after I got him: